Compensation-balance for time-pieces



(No Model.)

G. E. HUNTER.

COMPENSATION BALANCE FOR TIME PIECES.

N0. 347,297. Patented Aug. 10, 1886.

UNITED STATES PATENT OFFICE.

GEORGE E. HUNTER, OF ELGIN, ILLINOIS.

COMPENSATION-BALANCE FOR Tl ME PlECES.

Application filed May 2-2, li-G, Serial No. 303.0112.

T0 ail 1072 0722 may concern/.-

Be it known that I, (licence E. HUNTER, of Elgin, in the county of Kane, and in theState of Illinois, have invented certain new and useful Impro vemcnts in BalancedVheels for Ti me 5 Pieces; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to theaccompanying drawings, in which Figure 1 is a perspective view of the parts ofmy balance-wheel separated from each other. Fig. 2 is a like view of the same united, and Fig. 3 is a section of the completed balance through its plane of vibration.

Letters of like name and kind refer to like parts in each of the figures.

In the construction of balance wheels for time-pieces it has heretofore been customary to form the arm and the steel portion of the rim from one solid piece of steel, and the brass portion of said rim from a ring of such metal which has been fitted to and brazed upon said steel. Balances constructed in this manner are often defective, as the metals composing the rim do nothave uniform thickness, either jointly or severally, throughout their lengths, and the expansion and contraction of said rim are so unequal as to render impracticable the proper poising of the balance for the ordinary variations of temperature.

The design of my invention is to increase the efficiency of such balancewheels; and to this end it consists, principally, as a new article of manufacture, in a balance-wheel for time-pieces, comprising a spider, and attached thereto a divided rim composed of integrallyrolled bimetallic strips, substantially as and for the purpose hereinafter specified.

It consists, further, as a new article of manufacture, in a balancewheel for time pieces, comprising a spider and an attached divided rim composed of brazed or soldered and rolled bimetallic strips, substantially as and for the purpose hereinafter shown.

It consists, further, in a lime-piece balance wheel composed, of aspider or bar having at each end an npward-turned lug, and the rim :formed of two sections secured to the lugs by screws passi ng through the sections and tapped into the lugs, substantially as and for the purpose hereinafter set forth.

UQIFKUATION forming part of Letters Patent No. 347,297, dated August 10, 1886.

(No model.)

It consists, further, in a balance wheel for time-pieces, in the combination of the spider or bar having the upturned lugs, with the two rimsections, the screws fastening the sections to the lugs, and pins passing through the sections and the lugs, substantially as and for the purpose hereinafter described.

It consists, further, in a balance wheel for time-pieces, in the combination of the spider having the upturned lugs with the coinpensatiug rim-sections, the two screws, each one fastening an end of one of the rim-sections to one of the lugs on the spider, and two pins passing through each of the lugs and the respective rim-section on opposite sides of the fastening-screw, substantially as and for the purpose hereinafter specified.

It consists, finally, in a balance wheel for time-pieces, in the combination of the spider or bar having an upturned lug, with a com pensating rim-section provided at or near one end with a hole countersunk on its outer side, a screw passing through the rim-section and into the lug, provided with a collar fitting in the countersink, and a nut screwed 011 the outer end of the screw, substantially as and for the purpose hereinafter shown.

In the construction of my balance-wheel for time-pieces a spider or crossbar, A, is preferably made, by dies, from a strip of steel having sufficient width, and at each end is pro vided with an upward-turned lug, a, that has a length equal to about twice the width of said arm at such point.

The outer face of each of said lugs is formed upon a line which is concentric wit-h the axis of said spider, and within the same are formed a centrallydocated radial opening, a, that is threaded, and one or more plain round radial piiropenings, a".

The rim 13 consists of two curved sections having suitable lengths, each of which is co1nposed of an inner member, 71, of steel, and an outer member, 7), of brass. Said parts are united together by brazing, and by means of mills and rollers are given uniform thickness and width, and any desired density.

One end of each rim-section B is secured to one of the ends ofthe spider A by means of a screw, O, that passes through an opening, If, in the former, into the threaded opening a in said spider, and pins or rivets c, which pass through the openings a in the latter, and through corresponding openings, b*,in said rim. The outer projecting portion of said screw 0 is threaded, and upon the same is placed a nut, D, that corresponds in size and shape to the like features of the heads of adjusting-screws E, which are placed between said nut and the free end of said rim-section. Said nut is preferably split from one end nearly to its opposite end, and such split portion closed slightly inward, to cause it to grasp its screw with suf-' ficient firmness to prewznt accidental movement thereon.

Having thus described my invention, what I claim i s 1. As a new article of manufacture, a balance-wheel for timepieces, comprising a spider, and attached thereto a divided rim composed of integrally rolled bimetallic strips, substantially as and for the purpose specified.

2.- As a new article of manufacture, a balance-wheel for time-pieces, comprising a spider, and an attached divided rim composed of brazed or soldered and rolled bimetallic strips, substantially as and for the purpose shown.

3. A time-piece balance-wheel composed of a spider or bar having at each end an upwardturned lug, and the rim formed of two sections secured to the lugs by screws passing through the sections and tapped into the lugs, substantially as and for the purpose set forth.

4. In a balance wheel for timepieces, in

combination with the spider or bar having the upturned lugs, the two rim-sections, the screws fastening the sections to the lugs, and pins passing through the sections and the lugs, sub stantially as and for the purpose described.

5. In abalance-wheel for time-pieces, in com bination with the spider having the upturned lugs, the compensating rim-sections, the two screws, each one fastening an end of one of the rim-section's to one of the lugs on the spider, and two pins passing through each of thelugs and the respective rim-section on opposite sides of the fastening-screw, substantially as and for the purpose specified. I

6. In a balance-wheel for time-pieces, in conr bination with the spider or bar having an upturned lug, a compensating rim-section provided at or near one end with a hole countersunk 011 its 'outerside, a screw passing through the rim-section and into the lug, provided with a collar fitting in the countersink, and a nut screwed on the outer end of the screw, substantially as and for the purpose shown.

In testimony that I claim the foregoing I have hereunto set my hand this 28th day of April, 1886.

GEORGE E. HUNTER.

Vitnesses:

WM. H. OLoUDMAN, W. P. HEMMENS. 

